⚡ Bolt: [performance improvement] Optimize DBML column position calculation to O(1) - #645
⚡ Bolt: [performance improvement] Optimize DBML column position calculation to O(1)#645seonghobae wants to merge 1 commit into
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Replace O(N^2) inline generator `sum(...)` for column positions with O(1) dictionary counter `col_count_by_oid` in DBML parsing logic. - 💡 What: O(1) column position counting in `backend/app/spec/dbml_import.py` - 🎯 Why: Calculating `sum(1 for c in columns if c["relation_oid"] == oid) + 1` linearly for every new column creates O(N^2) complexity, degrading DBML parsing speeds on large datasets. - 📊 Impact: Significantly improves DBML import speed on schemas with many columns. - 🔬 Measurement: Verified with `pytest --cov=app` which maintains full parity.
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Pull request overview
This PR improves backend DBML import performance by eliminating an O(N²) column-position calculation inside parse_dbml, making DBML parsing scale better for large schemas.
Changes:
- Replaced per-column linear scans (
sum(...)) with an O(1) per-table counter map (col_count_by_oid) when assigningcolumn_position. - Added a Bolt performance note documenting the optimization and rationale.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| backend/app/spec/dbml_import.py | Uses col_count_by_oid to compute column_position in O(1), preserving 1-based ordering while avoiding repeated scans. |
| .jules/bolt.md | Documents the learning/action for avoiding O(N²) column position computation during DBML parsing. |
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Pull request overview
OpenCode cannot approve yet because required coverage evidence did not pass.
Review outcome
1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence
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Problem: The required coverage-evidence job result was
failure, so OpenCode cannot establish approval sufficiency for this head. -
Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.
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Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports
successwith required evidence or explicit no-source not-applicable evidence. -
Regression test: Keep the approval branch checking
needs.coverage-evidence.result == successbefore posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present. -
Result: REQUEST_CHANGES
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Reason: coverage-evidence result was
failure, so required test/docstring evidence was not proven for current head5576258800035f913d0dfa119fc66a6987f8602a. -
Head SHA:
5576258800035f913d0dfa119fc66a6987f8602a -
Workflow run: 30505467541
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Workflow attempt: 1
Coverage evidence
Coverage Decision
- Result: FAIL
- Test evidence: not proven passing
- Docstring evidence: not proven passing when configured
- Failure count: 1
Changed-File Evidence Map
flowchart LR
PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
Evidence --> S1["Changed file: bolt.md"]
S1 --> I1["repository behavior"]
I1 --> R1["Review risk: Changed file: bolt.md"]
R1 --> V1["required checks"]
Evidence --> S2["Backend: dbml_import.py"]
S2 --> I2["API and service runtime"]
I2 --> R2["Review risk: Backend: dbml_import.py"]
R2 --> V2["backend tests"]
OpenCode Review Overview
Pull request overviewOpenCode cannot approve yet because required coverage evidence did not pass. Review outcome1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence
Coverage evidenceCoverage Decision
Changed-File Evidence Mapflowchart LR
PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
Evidence --> S1["Changed file: bolt.md"]
S1 --> I1["repository behavior"]
I1 --> R1["Review risk: Changed file: bolt.md"]
R1 --> V1["required checks"]
Evidence --> S2["Backend: dbml_import.py"]
S2 --> I2["API and service runtime"]
I2 --> R2["Review risk: Backend: dbml_import.py"]
R2 --> V2["backend tests"]
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⚡ Bolt: [performance improvement] DBML parse optimize
Replace O(N^2) inline generator
sum(...)for column positions with O(1) dictionary countercol_count_by_oidin DBML parsing logic.backend/app/spec/dbml_import.pysum(1 for c in columns if c["relation_oid"] == oid) + 1linearly for every new column creates O(N^2) complexity, degrading DBML parsing speeds on large datasets.pytest --cov=appwhich maintains full parity.PR created automatically by Jules for task 7461202086995374457 started by @seonghobae